I have a 2006 GT convertible with a Shaker 500 system. I just swaped the head unit out with a Shaker 500 head unit from a 2008 Mustang. It works perfect, with one small glitch. The main reason I made this switch was to get a feature I knew the '08s had, that is a speaker setting called "Convertible". The '08 radio , as I said, works fine, but the only options I have are rear seats, all seats & drivers seat. I saw the feature on 2 rental cars I had in Hawaii, and it is mentioned in the '08 manual. I cannot believe Ford would have one radio for 'verts and one for coups. I am wondering if this is a programming thing, something that can be "turned on". Can anybody cast any light on this question? Maybe the name of a company that services Ford radios?